Roller crushing and grinding mill.



J. E. HOVENDIGK.

- ROLLER GRUSHING AND GRINDING MILL.

APPLIOATION FILED DEO.19,1910.

1,000,913. Patented Aug. 15, 191 1 WITNESSES:

W glNVEb/TOR. I r,

M 7 ZZZ ZI E S T S PATIENT. OFFICE JOHN E. HOVENDICK, or BLAIR, NEBRAs KA.

ROIiL'RR GRUSHIN G ANDfGRIN 'DING MILL.

Specification of Letters'Pateut. Patented Aug. 15,1911.

Application filed December 19, 1910. Serial No. 698,022.

a pair of plain cylindrical rolls operate in conjunction with means to adjustthem toward and from each other to regulate 'the fineness of the ground product and in-which the peripheral grinding surfaces of the opposed rolls are driven at dilferentspeedsj and the objects of my improvement are,

first, to provide in connection with a heavy stationarily disposed revolving roll, serving also as a fly-wheel, a much lighter roll rev olubly mounted on a light carriage whereby it may be easily reciprocated laterally-to its axis toward and from said large unyieldingly placed roll or fly-wheel; second to' provide an ample catch-binancl shovel-bin beneath the rolls and at the same time not unduly elevate the feed hopper; third, to provide a positive intake or bite ofthe rolls in connectlon with the hopper feed that will prevent clogging with kernels of any size or hardness and an unyielding abutment to prevent revolving clog when crushing vegetables, fruits or mast; fourth, to automatically accelerate the speed of the slow moving roll to approximately equal that of the more rapidly moving roll When an irreducible obstruction is accidentally passed between the ro'lls,"by whichequalization of motion-thegrinding action between the rollsis arrested and the obstruction more quickly thrown out, thus preserving the grinding surfaces uninjured; and, fifth, to provide means to yieldingly support one roll'toward the other with an adjustable detent to p.osi-' tively limit the approach of the yielding roll toward the other. These, with other minor objects, hereinafter noted, I- attain by the mechanism illustrated in the accom-; panying drawing in which Figure 1 is a top'or plan view with the hopper and large rollshieldacut away to reveal all the lower parts; and Fig. 2, is; a; side elevation partly in section. In all of which views the same reference; numerals refer to like parts.

- The heavy plank sides2 and?) and rear and shovel-bin beneath the mill and supply an elevated support therefor, on top of which the metal frame of themill is fastened by the lag-screws closing end 4, form a U-Shaped catchbin The metal frame of themill consists of the'two side channel-bar's 6 and 6,'spaced apartand disposed parallelly tor eceive the grinding rolls axiallycrosswise between, as shown, withtheir plates or webs downward and the side flanges standing upwardly. The forward ends of these sides are disposed:

across toprojectb'eyond and are bolted to I the inverted cross-channel bar 7; which cross-bar isof sufiicient length to span the bin beneath; while the rear ends ofthe sidebars are fastened directlyjon the: elevated. Across thetops top 8 ofthe end of the bin. of the forward ends of-the side-bars the angle-bar 9-:is fastened withits upstanding vertical flange fiushfwith the ends-of the side-bars. The,- whole frame thus being U shaped and reversely disposed to the U- shaped bin on which it rests.

' The large roll 10 is mounted on the driving-shaft l1 journaled across in the'boxes.

12 and 12 seated and fastened in the side channels to'dispose said roll at the rear end of the spacebetween the sides. /Tlie driving belt 'pulley13, is mounted'on one end of this driving shaft to receive a, driving-belt 14;

and a sprocket-wheel 15 is mounted on the opposite end of said shaft to carry and drive the sprocket chain 16' by which the small roll is driven.

The small roll 17 is mounted on the coun tershaft 18 journaled across in the boxes 19 I below their caps, are.

and 19. These boxes, integral top portions of the side-pieces or legs 20 and 20 of a:

forwardly and baclc wvardly slidable U-shaped carriage. To

complete saidcarriage, a connection is made at the forward ends of the sides by a cross angle-bar having the ends of its lower horizontal flange'21 seatedand rigidly fastened in recesses formed'between the shoulders 22 ing'lips 23 and 23- at the extreme ends of said, "side-pieces; vertical flange-.24 of said cross-angle-bar is orward disposed and fastened against said shoulders; thus. forming a'.rigid connection be-' tween the sides of the U shaped carriage,

which] corresponds in shape and position I with the-supporting frame, butis shorter. .The sides of the carriage are fitted to'slide the upstandingand '22 on the side-pieces and the u standi carry larger roll.

aredisposed throughlthevertical flange of between the flanges and on the plate or web of the side channels of the frame, and are vertical flange of-the anglebar 9 on the head of the frame and the vertical flange 24: of the angle-bar on the" head of the carriage, to yieldinglypress the carriage backwardly and hold the smallroll toward the The wheel screws 28 and 28 c the angle bar 9 and the nuts 29-thereagainst to engagethe ends of die-forward leaf 0 the spring to-increase the tension thereof when screwed inwardly, to increasethe pressure of said small roll toward the larger one. And the short adjusting-rod -.has its rear end flattened as shown. at 31 and riveted centrally to the horizontal flange 21 on the carriage head; the opposite threaded end is disposed forwardly and loosely through a central aperture in the vertical flange 9 on the frame- The wheel-nut 32 is mounted on this threaded end forward of the flange against which the nut bears tolimit the backward'movement of the carriage and small roll, to regulate the "fineness of the,

grinding. This arrangement allows thecarriage to slide forward against the action of the spring- A sprocket-wheel 33 is mounted on one I end. of the countershaft 18 carrying the small roll,- and in ali'nement with the. driving.

sprocketwheel 15. Farther forward the upright 34 is footed and bolted to theend' of the inverted cross channel-bar 7:, The stub axle 35 is disposed in the top of said upright and upon'thls stub axle the idler sprocketwheel 36 is mounted in alinement with the.

sprocket-wheels 'on' the roller shafts. The

forward loop of the sprocket chain is carried -b 3*? a v over thevsprocket wheel 33, to drivethe small roll in a direction opposite to the dithis idler; and the lower or return run of the sprocket chain passes backwardly rection of revolutionof the larger roll, all as indicated. by the arrows in Fig. 2; This chain and sprocket gearing, connecting the two rolls, is so calculatedand-constructed for speed, that the peripheral velocity of the larger roll is normally a little faster than that of thesmall roll; that isthegrinding and crushing surfaces of the larger roll ordinarily hasthe greater speed; this difference of speed adding grinding action to that of l crushing between the rolls. And attrition is further facilitated by the small semi-circular grooves 38 cut across the grinding faces parallel with the axes of the rolls.

But, when by accident some irreducible ob ject, which the rolls are. incapable of disintegrating, is passed between them, the yielding spring-pressed small roll, with carriage and connected sprocket-wheel will move forwardly away,- toward or to the position indicated by the broken circular line 39 in Fig. 2.- This forward movement of the sprocket wheel against the backward motion of that part of the sprocketchain that is; driving it, accelerates the speed of the small roll to fully equal that of-the larger. This stops for the'instantthe. grinding action between the rolls and more quickly discharges the obstruction, without injury to the grinding surfaces. v

- A splayed sided hopper 4 0 is supportedends riveted to th'e'outer flanges of the side channels of the frame, and on thefront uprights 42 footed and lag-screwed on the tops "onthe rear uprights'dl having their lower of the bin-sides as shown. By the use of a small roll in front I not only lighten the spring-pressed yielding and adjustable part of the mill, making it easier to manipulate 4 and control, but am enabled to set the hopper much lower with its feed-gate 43 opening close in and toward the mouth of the. I

mill. And by "this means the heavy stationarily-jour11aled roll has ample space back, of the hopper in which its size is increased so that it also serveswell as a fly-wheel to make the mill run smoothly; and by the large curvature of its grinding surface the intake or mouth of the mill is sharpened,

. making the bite more gradual so that large kernels of hard grain, like corn, \vill not re-",

\boundor clog in the mouth to let the rolls slide around thereon instead of drawing them in. The inner lower end of the hopper front 44 serves as a bumper or unyieldmg abutment to prevent a revolving clog or rebound,- caused 'by difference in speed of the opposed crushing and grinding faces, when crushing small vegetables, fruits or mast. The thumb-screw 45 is 'connected to regulate the opening of the feed gate.

A bent sheet-metalshield 46 to guard the exposed part of the large roll or fly-wheel, is fastened at its lower end by screwing it .to the back end of the catch-bin and its top is supported from the back of the hopper as shown. I claim:

'1. The combination ofa stationarily journaled roller, an opposed laterally reciproeating roller, means connected to carry said reciprocating roller and yieldingly press it toward said stationarily journaled roller, 9. driving sprocket wheel rigidly connected to said stationarilyjournaled roller, an endless 5 ciprocating-roller and disposed outside ofthe loop of said chain and in engagement with the run of the chain toward said dri ving sprocket wheel.

2. Thecoinbination of a stationarily-jouri1 0 1131 ed driving k t; Wheel, a Sprocket chain carried by said driving sprocket wheel, a stationarily-journaled idler to carry the opposite loop of said chain, a driven sprocket wheel disposed outside of the loop of said chain and in engagement with the 15 return run thereof toward said driving sprocket wheel, and means connected to reciprocatingly carry said driven sprocket wheel along said return run of said chain.

In testimony whereof I have affixed my 20 signature in presence of two Witnesses.

JOHN E. HOVENDIGK.

Witnesses HERMAN H. S'rRUvE, GEO. B. WELLSEY. 

